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Biology Essay

Various Essays
Helper T cells secrete cytokines. Cytokines provide amplification mechanism by proliferation and differentiation (stimulation of B cell clonal expansion). They also determine the type of antibodies produced (Sridhar, 2012).Human immunodeficiency virus (HIV) attacks a protein, CD4, on helper T cells of the immune system and associates with it. These cells are the immune system’s main infection fighting cells. T helper cells are necessary for activation of B-cells and cytotoxic T-cell immune
Pages: 5 (1250 words), Essay
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Volitile Organic compunds (VOC's) / soot hair spray
The artificially occurring VOCs are have diversified sources. Sometimes artificial volatile organic compounds are directly used, and sometimes they are produced as a byproduct during some domestic or industrial operations. VOCs are abundantly used in household commodities like paints; air fresheners; refrigerators; insect repellents. Most of the times VOCs themselves are not considered as ingredients, rather they are the gases that are released slowly, but constantly from the chemicals that are
Pages: 5 (1250 words), Essay
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Virulence of campylobacter coli /result,figure and discussion
Blood Agar plates (Oxoid code Cm331), oxidase, catalase, and hippurate tests were requested further affirmation and speciation as demonstrated in the figure 1.2 Representation of DNA products (Lane M. molecular marker DNA ladder 100 bp samples 1-10) from PCR using C. coli (col) primer. In addition, an indication of positive and negative Campylobacter species from 8 chickens control containing genomic DNA of C.coli and free nuclease water instead of genomic DNA respectively.From figure 1.2,
Pages: 20 (5000 words), Essay
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